This interactive scatterplot visualizes daily river temperature and turbidity data from 2015, plotting each day as a circle with position encoding both variables. Hovering a point highlights it in red and displays its exact values in a tooltip. The visualization uses D3 v5 with SVG rendering, employing `scaleLinear` for both axes, `axisBottom` and `axisLeft` for tick marks, and `.on('mouseover')` events to trigger the highlighting and tooltip updates.